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package com.sun.enterprise.deployment.node;

import com.sun.enterprise.deployment.EntityManagerFactoryReferenceDescriptor;
import com.sun.enterprise.deployment.InjectionTarget;
import com.sun.enterprise.deployment.xml.TagNames;
import org.w3c.dom.Node;

import java.util.Map;

/**
 * This node handles all persistence-unit-ref xml tag elements
 * 
 * @author  Shing Wai Chan
 * @version 
 */
public class EntityManagerFactoryReferenceNode extends DeploymentDescriptorNode {
    
    public EntityManagerFactoryReferenceNode() {
        super();
        registerElementHandler(new XMLElement(TagNames.INJECTION_TARGET), 
                                InjectionTargetNode.class, "addInjectionTarget");                          
    }
    
    /**
     * all sub-implementation of this class can use a dispatch table to map
     * xml element to method name on the descriptor class for setting
     * the element value. 
     *  
     * @return the map with the element name as a key, the setter method as
     *         a value
     */    
    protected Map getDispatchTable() {
        // no need to be synchronized for now
        Map table = super.getDispatchTable();
        table.put(TagNames.PERSISTENCE_UNIT_REF_NAME, "setName");
        table.put(TagNames.PERSISTENCE_UNIT_NAME, "setUnitName");        
        return table;
    }
    
    /**
     * write the descriptor class to a DOM tree and return it
     *
     * @param parent node in the DOM tree 
     * @param node name for the root element of this xml fragment      
     * @param the descriptor to write
     * @return the DOM tree top node
     */
    public Node writeDescriptor(Node parent, String nodeName, EntityManagerFactoryReferenceDescriptor descriptor) {    
        Node entityMgrFactoryRefNode = appendChild(parent, nodeName);
        writeLocalizedDescriptions(entityMgrFactoryRefNode, descriptor);
        
        appendTextChild(entityMgrFactoryRefNode, TagNames.PERSISTENCE_UNIT_REF_NAME, descriptor.getName());      
        appendTextChild(entityMgrFactoryRefNode, TagNames.PERSISTENCE_UNIT_NAME, descriptor.getUnitName());      
        if( descriptor.isInjectable() ) {
            InjectionTargetNode ijNode = new InjectionTargetNode();
            for (InjectionTarget target : descriptor.getInjectionTargets()) {
                ijNode.writeDescriptor(entityMgrFactoryRefNode, TagNames.INJECTION_TARGET, target);
            }
        }
            
        return entityMgrFactoryRefNode;
    }
}
